Remove support for MetroWerks CodeWarrior compiler.

This compiler doesn't exist any more and was probably unsupported even in 2.8,
let alone 2.9, so remove all the __MWERKS__ tests to simplify things.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71102 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/utilsunx.cpp

@@ -69,26 +69,6 @@
 
 #endif // HAS_PIPE_STREAMS
 
-#if defined(__MWERKS__) && defined(__MACH__)
-    #ifndef WXWIN_OS_DESCRIPTION
-        #define WXWIN_OS_DESCRIPTION "MacOS X"
-    #endif
-    #ifndef HAVE_NANOSLEEP
-        #define HAVE_NANOSLEEP
-    #endif
-    #ifndef HAVE_UNAME
-        #define HAVE_UNAME
-    #endif
-
-    // our configure test believes we can use sigaction() if the function is
-    // available but Metrowekrs with MSL run-time does have the function but
-    // doesn't have sigaction struct so finally we can't use it...
-    #ifdef __MSL__
-        #undef wxUSE_ON_FATAL_EXCEPTION
-        #define wxUSE_ON_FATAL_EXCEPTION 0
-    #endif
-#endif
-
 // not only the statfs syscall is called differently depending on platform, but
 // one of its incarnations, statvfs(), takes different arguments under
 // different platforms and even different versions of the same system (Solaris